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Voltage regulator operable to switch between a two-stage structure operation and a three-stage structure operation

a voltage regulator and three-stage structure technology, applied in the direction of differential amplifiers, amplifiers with semiconductor devices/discharge tubes, instruments, etc., can solve the problems of increasing chip area, difficult to significantly improve the power supply voltage rejection ratio and the transient response characteristic, and the three-stage structure is not suitable to achieve low power consumption

Inactive Publication Date: 2013-05-07
ABLIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]According to the feature of the structure in this application, a voltage regulator having a two-stage structure suitable for low-current consumption operation and a voltage regulator having a three-stage structure suitable for high-speed response may be automatically or externally switched. In addition, a mounting area is smaller than in a case where amplifying units are separately prepared for the voltage regulator having the two-stage structure and the voltage regulator having the three-stage structure.

Problems solved by technology

In the structure, the number of through paths is small and thus the current consumption may be reduced, but there is a problem that it is difficult to significantly improve the power supply voltage rejection ratio and the transient response characteristic.
Therefore, the three-stage structure is not suitable to achieve low power consumption.
However, the structure described in Japanese Patent Application Laid-open No. 2002-287833 (FIG. 1) requires the output transistors equal in number to circuits to be switched, leading to an increase in chip area.
Therefore, when the plurality of output transistors are switched, a charge and discharge time becomes long.
Thus, there is a problem that a fluctuation in output voltage during switching is large.
Therefore, there is a problem that it is difficult to reduce a cost.

Method used

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  • Voltage regulator operable to switch between a two-stage structure operation and a three-stage structure operation
  • Voltage regulator operable to switch between a two-stage structure operation and a three-stage structure operation
  • Voltage regulator operable to switch between a two-stage structure operation and a three-stage structure operation

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first embodiment

[0037]FIG. 1 is a circuit diagram illustrating a voltage regulator according to a first embodiment of the prevent invention.

[0038]The voltage regulator according to the first embodiment includes a reference voltage circuit 109, an output transistor 147, a voltage dividing circuit 127, differential amplifier circuits 124 and 125, bias circuits 122 and 123, and a control circuit 121.

[0039]Next, the connection of the constituent circuits of the voltage regulator according to the first embodiment is described.

[0040]An output terminal of the reference voltage circuit 109 is connected to a non-inverting input terminal 108 of the differential amplifier circuit 124 and an inverting input terminal 105 of the differential amplifier circuit 125. An output terminal of the differential amplifier circuit 124 is connected to an input terminal 104 of the differential amplifier circuit 125. An output terminal of the differential amplifier circuit 125 is connected to a gate of the output transistor 1...

second embodiment

[0057]FIG. 3 is a circuit diagram illustrating a voltage regulator according to a second embodiment of the present invention.

[0058]The voltage regulator according to the second embodiment includes the reference voltage circuit 109, the output transistor 147, the voltage dividing circuit 127, the differential amplifier circuits 124 and 125, a bias circuit 310, and the control circuit 121. FIG. 3 is different from FIG. 1 in that the bias circuit 310 is provided instead of the bias circuits 122 and 123.

[0059]Next, the connection of the constituent circuits of the voltage regulator according to the second embodiment is described.

[0060]The connection of the bias circuit 310 is described.

[0061]A gate and drain of a P-channel transistor 301 are connected to the constant current circuit 131 and a gate of a P-channel transistor 302, and a source thereof is connected to the power supply terminal 101. A drain of the P-channel transistor 302 is connected to the switching circuit 150 and a sourc...

third embodiment

[0068]FIG. 4 is a circuit diagram illustrating a voltage regulator according to a third embodiment of the present invention.

[0069]The voltage regulator according to the third embodiment includes the reference voltage circuit 109, the output transistor 147, the voltage dividing circuit 127, the differential amplifier circuits 124 and 125, the bias circuit 310, and an external terminal 401. FIG. 4 is different from FIG. 3 in that the control circuit 121 is removed and the external terminal 401 is provided. The external terminal 401 is connected to the switching circuit 150.

[0070]Next, an operation of the voltage regulator according to the third embodiment is described.

[0071]A structure in which a signal is input from the external terminal 401 is employed instead of the control circuit 121 used in the voltage regulator according to the second embodiment. Through the input of an “H” or “L” signal from the external terminal 401, manual selection may be achieved between a voltage regulato...

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Abstract

Provided is a voltage regulator having a structure in which an output terminal of a first differential amplifier circuit is connected to a second differential amplifier circuit to control an output transistor by the second differential amplifier circuit. When low current consumption is required, the first differential amplifier circuit is suspended. When high-speed response is required, the first differential amplifier circuit is activated. The low-current consumption operation and the high-speed operation are switched with a minimum circuit area.

Description

RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119 to Japanese Patent Application Nos. 2009-225467 filed on Sep. 29, 2009 and 2009-260332 filed on Nov. 13, 2009, the entire content of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a voltage regulator for generating a constant voltage, and more particularly, to a control circuit for controlling operating states of a plurality of differential amplifiers to obtain operating states suitable for low current consumption and high-speed operation.[0004]2. Description of the Related Art[0005]In recent years, with the spread of mobile devices, market demands for compact and light batteries have been increased. In contrast, an operating time of the mobile devices greatly influences product differentiation. Therefore, reduction in power consumption of electronic circuitry is an absolute must.[0006]One of the solutions is to p...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G05F3/04G05F3/16G05F3/08G05F3/20
CPCG05F1/565H03F2200/555H03F2203/45244H03F2203/45648H03F2203/45466H03F2203/45506H03F2203/45618H03F2203/45366
Inventor IMURA, TAKASHI
Owner ABLIC INC